Hi,

I have a 2015 with 137,000 miles, and a few days ago I started noticing a shudder when accelerating, and today it has become worse. From the outside, it sounds like rattling. The shuddering stops when coasting, it is at its worst when accelerating from a stop but still happens when you speed up while already moving, up until around 40MPH where after that it is not really noticeable. Up until yesterday, it was just a consistent judder when accelerating, but today it has some worse judders where it almost feels like a slipping.

Here is a list of things I have checked:

• When outside of the car, I can hear it from both sides of the car.
• RPM seems consistent when it is juddering.
• I can also feel it though the pedal and steering wheel.
• When I put the car on jack stands, put the car in drive, and accelerate (wheels in the air) I do not hear/feel it.
• Transmission fluid is at the correct level (HFC-2, changed 10,000 miles ago), no metal shavings or burnt smell when I opened the fill plug to check the level.
• Oil was changed a couple of weeks ago, no issues following that until a couple of days ago.
• Fuel injectors were replaced under the extended warranty on them around a year ago.
• The drivers side CV axel is solid, no movement.
• The passenger side CV axel has slight in and out play, but no up/down or side to side play.
• With the car on the ground, I started it, put it in drive and while holding the brake, and revved the engine to try to test the engine mounts, I didn’t not hear the rattle (I know this is not a perfect test).
• It also happens in reverse.
• I have checked engine mounts, control arm bushings and the torque mount, nothing looks failed, ripped or has any excessive play.
• No codes when doing a full system scan with a BlueDriver.

I have a feeling it is something between the transmission and the wheels. Any ideas as to what I can check?

Thank you in advance.